The new compact, yet powerful Crimson Trace Rail Master is a great laser sight that fits virtually on any firearm with a picatinny or weaver style rail system. The sight features ambidextrous control tabs for easy activation and deactivation and features the brightest green laser as allowed by law. Furthermore, the laser also has an impressive 2 hours of constant on run time on a single 1/3N Lithium battery and features a 5 minute auto shut-off. The laser is user adjustable for windage and elevation and features 3 modes of operation: momentary, strobe, and constant-on.